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Diagnosis procedure for power module using multimeter
[Inverter section]
Set the multimeter to resistance range of × 100. If × 100 is not provided, measure with the range of ×
1 to × 100.
If the pointer does not swing when the following continuity check is performed, it is normal.
(When a digital multimeter is used, + and - terminals will be reversed, since the orientation of built-in
battery is inverted.)
Note:
If internal circuit of power module is disconnected (open) and pointer of the mutimeter does not swing,
it may be assumed to be normal. If the pointer swings when + and - terminals are connected in
reverse, it is normal. Compare swing statuses for U, V and W phases: If the statuses at all 3 points are
the same, it is normal.
− ＋ ＋
− ＋ ＋
W
V
U
P
N
W
V
U
N
P
- 93 -
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